Improvement in sprinkling-pipes



GRINNELL.

SPR'INKLING-PIPE.

Patented Nov. 2, 1875.-

-1\TITED STATES PATENT FF FREDERICK GRINNELL, OF PROVIDENCE, RHODEISLAND.

IMPROVEMENT IN SPRlNKLlNG-PIPES.

Specification forming part of Letters Patent No. 169,355, dated November2, 1875; application filed June 16, 1875.

. To all whom it may concern:

of the city and county of Providence, in the State of Rhode Island, haveinvented certain new and useful Improvements relating tosprinkling-Pipes, of which the following is a specification The pipesmaybe used in various situations, but are intended more particularly tobe arranged near ceilings of those parts of cottonmills and otherbuildings which are most liable to the bursting out of fires from anycauses. Experience has demonstrated the utility and importance ofperforated pipes in such situations connected with large tanks or withpumps adapted to supply water under considerable pressure without anydelay, and to distribute the same uniformly over the ceiling and theentire area below.

I have devised a form of perforation which can be produced with moreeconomy, and will keep itself more easily clear, and will throw a finestream of water with more force, than any heretofore known to me.

The accompanying drawings form a part of this specification, andrepresent what I consider the best means of carrying out the invention.

Figure 1 is the plan view, and Fig. 2 is a cross-section on a largerscale. 4

y In the figures, A represents the body of the pipe of wrought-ironwelded, and A the holes therein.v Each hole is large at the exterior enda. It contracts conically to a small diameter, and is continued ofsmalldiameter through to the interior of the tube.

In the use of my pipes the water filling the tubes and pressing for exitforms in small smooth streams, having a diameter corresponding with thediameter of the small part a of the holes. It flows through the enlargedouter part without contact with the sides thereof. The holes areproduced in this form very rapidly and cheaply by machinery, taking careto produce the large part a first, by a large drill suitably operated,and then, after the point of the large drill has penetrated nearly tothe inner surface of the pipe, a small drill is introduced to completethe hole. In this manner of operating, drills may be used to complete ahole of a fineness and delicacy which would not endure the rough usageof penetrating the hard scale on the exterior of the pipe. I usuallyproduce three rows of these holes, and arrange the pipe with the holeson the upper side, so that one row of I holes throws the watervertically upward, and the other two throw rightand the left.

The number of lines of holes may be one or more, to suit circumstances.

I claim as my invention- A pipe having the sprinkling-apertures a a, thelarger portion a being on the outside, and the smaller portion a beingon the inside, of the pipe, and adapted to operate as herein specified.

In testimony whereof I have hereunto set my hand this 11th day of June,1875, in the presence of two subscribing witnesses.

' FREDERICK GRINNELL. Witnesses:

F. H. MAYNARD, F. W. HARTWELL.

it obliquely to the,

